Zombies flinching too much fixed

Now compatible with nemez soldiers

New update:

-Minor speed adjustments for the zombies

-Combine grunts gas cans explosions restored to vanilla behaviour. There was some odd and unintended behaviour.

Zombies attack slightly faster

-Increased low ammo threshold

-When shooting a grunt on his gas tank, there is a small chance he will recover from panic and keep shooting

Combine rate of fire lowered on easier difficulties

Grenades explode faster now

Combine accuracy slightly decreased on hard difficulty

Charger now has several shooting patterns and raises his shield sooner and faster.

Reviver headcrab is more resilient when inside a zombie.

Fixed Armored headcrab not dying from one shot to the heart